Messages in this thread Patch in this message | | | From | Greg Pearson <> | Subject | [PATCH v2 1/1] x86: Use x2apic physical mode based on FADT setting | Date | Tue, 24 Apr 2012 18:23:56 -0600 |
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Provide systems that do not support x2apic cluster mode a mechanism to select x2apic physical mode using the FADT FORCE_APIC_PHYSICAL_DESTINATION_MODE bit.
Changes from v1: (based on Suresh's comments) - removed #ifdef CONFIG_ACPI - removed #include <linux/acpi.h>
Signed-off-by: Greg Pearson <greg.pearson@hp.com> --- arch/x86/kernel/apic/x2apic_phys.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c index 8a778db..991e315 100644 --- a/arch/x86/kernel/apic/x2apic_phys.c +++ b/arch/x86/kernel/apic/x2apic_phys.c @@ -24,6 +24,12 @@ static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) { if (x2apic_phys) return x2apic_enabled(); + else if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) && + (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL) && + x2apic_enabled()) { + printk(KERN_DEBUG "System requires x2apic physical mode\n"); + return 1; + } else return 0; } -- 1.7.5.4
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